From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Table of altitude data showing barometric pressure and temperature at various heights.
| Identifier | ExFiles\Box 149\1\ scan0171 | |
| Date | 8th August 1935 | |
| x1763 HS{Lord Ernest Hives - Chair}/BWG.{J. C. Bowring} 9/KW. 8. 8. 35. ALTITUDE DATA. Altitude Barometric Pressure Temperature. Feet Mercury lbs/sq" °C °F m/metres Ins. 0 760 29.92 14.7 15.00 59.0 1000 733 28.86 14.17 13.00 55.4 2000 707 27.82 13.67 11.00 51.8 2500 694 27.31 13.42 10.00 50.0 3000 681 26.81 13.18 9.00 48.2 3500 669 26.32 12.94 8.00 46.4 4000 656 25.84 12.70 7.1 44.8 4500 644 25.36 12.45 6.1 43.0 5000 632 24.89 12.22 5.1 41.2 5500 621 24.43 12.00 4.1 39.4 6000 609 23.98 11.78 3.1 37.6 6500 598 23.53 11.56 2.1 35.8 7000 586 23.09 11.34 1.1 34.0 7500 575 22.65 11.13 .1 32.2 | ||